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Not sure I fully understand what you did.
I hope that you didn't disconnect the fan on top of your heat sink on the CPU and think that a case fan would be sufficient to cool down your processor. If you did you probably won't be able to respond to this because your computer will overheat and shut down.
If you simply added a 80mm case fan to the back of your box it should be used to exhaust the hot air from inside. Ideally you should have a fan on the front of the box to suck in cool air.
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